MC and YC have been close friends since childhood, growing up together through high school. However, they did end up in different crowds. YC Was the popular cheerleader type while MC was a bit more of a loner. Although they had different social circles they remained friends. A week before prom YC and her boyfriend have a nasty breakup, which leaves YC feeling really down. However MC suggests that the two of them should go to prom together. YC agrees knowing it'll be better than being alone, plus it could piss off her ex.
However at the dance itself YC finds herself having a great time with MC which leads to them having fun at an after party and then going to the hotel YC had booked well before she broke up with her BF.